php mail发送csv附件丢失第一行信息

附件程序代码：

$uid = md5(time());
$eol = PHP_EOL;
$message = "--" . $uid . $eol;
$message .= "Content-Type: text/html; charset=UTF-8" . $eol;
$message .= "Content-Transfer-Encoding: 8bit" . $eol . $eol;
$message .= "Please check the attach file." . $eol;
$message .= "--" . $uid . $eol;
$message .= "Content-Type: application/octet-stream; name=\"$fname"" . $eol;
$message .= "Content-Transfer-Encoding: base64" . $eol;
$message .= "Content-Disposition: attachment; filename=\"$filename"" . $eol;
$content = chunk_split(base64_encode(mb_convert_encoding(file_get_contents($file),'UTF-8')));
//$message .= $content.$eol ;//这是有问题的代码
$message .= $eol.$content ;//正确的代码
$message .= "--" . $uid . "--";

查看丢失内容的邮件内容 show original

--db9a66bd76c51e6da33912af726022b1
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

Please check the attach file.
--db9a66bd76c51e6da33912af726022b1
Content-Type: application/octet-stream; name="Z8020181010151831"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="Z8020181010151831.csv"

ZSxjb3VudHJ5LHBvc3Rjb2RlLHRlbGVwaG9uZSxza3UscHJpY2UscG9zdGFnZSxxdHksDQo3MjIx
OTE5OSxLaW0sQnVja2J5LDIgTWFybG93IFJvYWQsS2Vzd2ljayxTQSxBdXN0cmFsaWEsNTAzNSw4
ODM3MTIzNjYsU0gtQ0wtMTgzWDUwMC0xNzUtR1IsMTY2LjEsMCwxLCANCjcyMjUwNjU3LEFtYW5k

查看未丢失的show original

--db9a66bd76c51e6da33912af726022b1
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

NTA5LDQyNTgwMDA4OSxTQUxPTi00MTI4LUJLLDM4LjUsMCwxLCANCjcyMjUzMTMxLEVpbWVhcixI //丢了这一行
ZSxjb3VudHJ5LHBvc3Rjb2RlLHRlbGVwaG9uZSxza3UscHJpY2UscG9zdGFnZSxxdHksDQo3MjIx OTE5OSxLaW0sQnVja2J5LDIgTWFybG93IFJvYWQsS2Vzd2ljayxTQSxBdXN0cmFsaWEsNTAzNSw4 ODM3MTIzNjYsU0gtQ0wtMTgzWDUwMC0xNzUtR1IsMTY2LjEsMCwxLCANCjcyMjUwNjU3LEFtYW5k

是不是content第一行都要截掉，那就多加一行空行，让他截空行就好了，就加了
$message .= $eol.$content ;
果真没在丢失

php mail发送csv附件丢失第一行信息

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